NEGLECTFUL, adjective 1. Heedless; careless; inattentive. 2. Accustomed or apt to omit what may or ought to be done. 3. Treating with neglect or slight. 4. Indicating neglect, slight or indifference; as a neglectful countenance.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI